Animal marking tag consisting of a shell comprising two coloured elements, namely a carbon black element and a brightly-coloured element

Button for marking and identifying an animal that receive a guide pin by irreversible latching, this button comprises two shells (3,4) obtained by molding a plastic material, an upper (4) and lower (3) being, They are hosting including an electronic element (12) for identification of the animal and that are joined to each other by welding with laser beam being the lower housing (3) translucent for the passage of the beam while the upper housing (4) is colored to block passage of beam during welding operation of the shells (3,4) together, characterized in that the upper casing (4) consists of at least two elements (5,6) together in axial extension of each other , of which a base element (5) dark to obstruct the passage of laser beam and the top element (6).